61996789 has 2 divisors, whose sum is σ = 61996790. Its totient is φ = 61996788.

The previous prime is 61996771. The next prime is 61996813. The reversal of 61996789 is 98769916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50552100 + 11444689 = 7110^2 + 3383^2 .

It is a cyclic number.

It is not a de Polignac number, because 61996789 - 2⁵ = 61996757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61996769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30998394 + 30998395.

It is an arithmetic number, because the mean of its divisors is an integer number (30998395).

Almost surely, 2^61996789 is an apocalyptic number.

It is an amenable number.

61996789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61996789 is an equidigital number, since it uses as much as digits as its factorization.

61996789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 61996789 is about 7873.8039726678. The cubic root of 61996789 is about 395.7823281673.

The spelling of 61996789 in words is "sixty-one million, nine hundred ninety-six thousand, seven hundred eighty-nine".